Bounds on effective Majorana neutrino masses at HERA

1999/11/30 by M. Flanz, Marion Flanz, Werner Rodejohann +2 · 37 citations
Physics and Astronomy · #Collider #Electron #HERA #High-Energy Particle Collisions Research #Lepton #MAJORANA #Muon #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum chromodynamics #Tau neutrino #hep-ph

paper · pdf · doi:10.1016/s0370-2693(99)01483-5

published in Physics Letters B 473(3-4), 324-329 (Elsevier BV) · 9 pages, 4 figures, revised version

openalex publication_date 2000/02/01 · arxiv created 2000/03/07 · arxiv updated 2011/07/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The lepton-number violating process e p → nu_e l l' X mediated by Majorana neutrinos is studied for the HERA collider for (l l') = (e tau), (mu tau), (mu mu) and (tau tau). Only the muonic decay of the tau is considered. The direct limit on the effective muon Majorana mass, <m_{mu mu}> is improved significantly to 4.0 times 10³ GeV and for the first time direct limits on the analogous effective masses connected with the tau sector are given, namely 4.2 times 10³ GeV for <m_{e tau}>, 4.4 times 10³ GeV for <m_{mu tau}> and 2.0 times 10⁴ GeV for <m_{tau tau}>. We find that a more general analysis for an upgraded HERA could improve this values by a factor of up to 40, yet still being orders of magnitude worse than indirect limits.

Cited by

• NEUTRINO-LESS DOUBLE BETA DECAY AND PARTICLE PHYSICS
• Left-right symmetry and lepton number violation at the Large Hadron electron Collider
• Charged Higgs boson effects in the production and decay of a heavy Majorana neutrino at the CERN LHC
• The search for heavy Majorana neutrinos
• Double beta decay of Σ− hyperons
• Survey of lepton number violation via effective operators